WO2021184647A1

WO2021184647A1 - Feed lifting rock trimming assembly and sewing machine comprising same

Info

Publication number: WO2021184647A1
Application number: PCT/CN2020/107007
Authority: WO
Inventors: 黄明学; 万义明; 林晓晓; 洪志敏
Original assignee: 杰克缝纫机股份有限公司
Priority date: 2020-03-19
Filing date: 2020-08-05
Publication date: 2021-09-23
Also published as: CN111197203B; CN111197203A

Abstract

A feed lifting rock trimming assembly and a sewing machine comprising same. The feed lifting rock trimming assembly comprises a drive portion (2), and a front feed lifting rock shaft (12) and a rear feed lifting rock shaft (18) which are provided in parallel. The front feed lifting rock shaft (12) is fixedly provided with a front feed lifting rock crank (14); the rear feed lifting rock shaft (18) is fixedly provided with a rear feed lifting rock crank (16); the front feed lifting rock crank (14) is rotatably connected to a first end of a front feed lifting rock swing plate (20); the rear feed lifting rock crank (16) is rotatably connected to a first end of a rear feed lifting rock swing plate (21); the drive portion (2) is connected to a feed lifting rock drive device and a trimming drive device (501); a second end of the front feed lifting rock swing plate (20) and a second end of the rear feed lifting rock swing plate (21) are rotatably connected to one end of the feed lifting rock drive device, separately; after the drive portion (2) drives, the height of a feed dog is adjusted; the trimming drive device (501) is connected to a trimming drive portion (07); after the drive portion (2) drives, the trimming drive portion (07) and a trimming cam (05) can synchronously rotate to achieve trimming. The feed lifting rock trimming assembly can conveniently and rapidly control the height of the feed dog, can achieve the linkage of feed lifting rock and a trimming operation, and reduces the structural complexity while improving the production efficiency.

Description

Thread-lifting and thread-cutting component and sewing machine with the thread-lifting and thread-cutting component

This application claims the priority of a Chinese patent application filed with the Chinese Patent Office on March 19, 2020, the application number is 202010196368.5, and the invention title is "a thread-raising thread trimmer assembly and a sewing machine with the thread-raising thread trimmer assembly". The entire content is incorporated into this application by reference.

Technical field

The present invention relates to the technical field of sewing equipment, in particular to a thread-lifting and thread-cutting assembly and a sewing machine with the thread-lifting and thread-cutting assembly.

Background technique

As we all know, the sewing machine is a machine that uses one or more sewing threads to form one or more stitches on the sewing material to interweave or sew one or more layers of sewing materials. The sewing machine usually consists of a feeding device, a base, The transmission and accessories are composed of four parts, and the movement of each mechanism is reasonably coordinated, and the sewing material is stitched together.

In the prior art, for sewing machines, especially lockstitch machines, the horizontal movement direction of the feeding teeth is controlled by the feeding shaft, the vertical movement direction of the feeding teeth is controlled by the lifting shaft, and the phase of the horizontal and vertical directions is controlled by the feeding eccentricity. The wheel decides, and finally forms the elliptical trajectory of the feeding teeth. When the thickness of the sewing fabric changes, in order to achieve a better sewing effect, the height of the teeth needs to be adjusted. Nowadays, conventional sewing machines are complicated to adjust the tooth height and cannot be precisely controlled. When the fabric is placed at the beginning of the seam, the teeth are in a high position and the fabric will hang.

At the same time, for trimming operations, the thread ends are often longer after trimming, which is not conducive to improving production quality.

In summary, how to provide a sewing machine capable of conveniently and quickly realizing the linkage of the thread lifting and thread trimming operations is a technical problem that those skilled in the art need to think about.

Summary of the invention

The purpose of the present invention is to provide a thread-lifting and thread-cutting assembly and a sewing machine with the thread-lifting and thread-cutting assembly, which can conveniently and quickly control the height of the feeding teeth, and can realize the linkage of the thread-raising and thread-cutting operations, and improve production efficiency. At the same time reduce the complexity of the structure.

In order to achieve the above objective, the present invention provides a tooth lifting thread trimmer, which includes a driving part, and also includes a front lifting shaft and a rear lifting shaft that are arranged in parallel, and the front lifting shaft is fixed with a front lifting crank and a rear lifting tooth. The shaft is fixedly provided with a rear tooth lifting crank, the front tooth lifting crank is rotatably connected with the first end of the front tooth lifting swing plate, and the rear tooth lifting crank is rotatably connected with the first end of the rear tooth lifting swing plate;

The driving part is connected with the thread lifting driving device and the thread trimming driving device. The second end of the front lifting swing plate and the second end of the rear lifting swing plate are respectively connected to one end of the lifting driving device in rotation; driven by the driving part Later, the included angle between the front lifting crank and the rear lifting crank is changed so that the front lifting shaft and the rear lifting shaft can rotate relative to each other to adjust the height of the feeding teeth;

The thread trimming driving device is connected with the thread trimming driving part; after being driven by the driving part, the thread trimming driving part can rotate synchronously with the thread trimming cam to realize the thread trimming.

Optionally, the tooth-lifting driving device includes a tooth-lifting adjustment swing link, and the second end of the front-tooth-lifting swing plate and the second end of the rear-tooth-lifting swing plate are respectively rotatably connected to one end of the tooth-lifting adjustment and swing link, The tooth-lifting adjustment swing link is connected to the driving part through a transmission device, and when the driving part is driven, the tooth-lifting adjustment swing link swings.

Optionally, the thread trimming driving device includes a ball, a swinging part, and a conducting part. The ball is fixed on the thread trimming driving part, and the conducting part is connected with the swinging part. When the swinging part moves at a predetermined angle under the action of the output shaft of the driving part, The oscillating part triggers the movement of the conducting part, and the ball is against the thread trimming cam under the action of the conducting part, so that the ball and the thread trimming cam rotate synchronously.

Optionally, the transmission device includes a rocker, a driving connecting rod, and a driving crank. The first position of the driving crank is fixedly connected to the output shaft of the driving part. The second position of the driving crank is rotatably connected to the first end of the driving connecting rod. The second end of the connecting rod is rotatably connected to the first position of the rocker, the second position of the rocker is rotatably connected to the lifting adjustment swing link, and the third position of the rocker is rotatably connected to the fixed end.

Optionally, the thread trimming drive part is fixed on the thread trimming drive shaft, the swing part is specifically a rotating crank, and the conduction part is specifically a special-shaped rod. The part and the rotating crank are connected in rotation; both the thread trimming slope and the equidistant plane can be selectively contacted with the thread trimming drive shaft;

When the thread trimming bevel is in contact with the thread trimming drive shaft, the ball and the thread trimming cam abut to make the ball and the thread trimming cam rotate synchronously.

Optionally, the end of the special-shaped rod is provided with a bending section, and the bending section includes two mounting plates arranged at intervals. The two ends of the positioning pin are respectively matched with the two limiting holes, and the limiting pin is matched with the limiting groove, so that the special-shaped rod and the rotating crank are rotationally connected.

Optionally, the transmission device is specifically an adjusting eccentric wheel, the output shaft of the driving part is fixed to the eccentric hole of the adjusting eccentric wheel, and the end of the lifting adjusting swing link is rotatably connected to the adjusting eccentric wheel;

The swing part is specifically a thread trimming lever, the first end of the thread trimming lever is rotatably connected to a fixed position, and the second end of the thread trimming lever is in sliding fit with the adjusting eccentric wheel;

The conductive part is located at a position far away from the second end of the thread trimming lever. When the preset angle of the eccentric wheel is adjusted, the thread trimming lever rotates. The line cams offset.

Optionally, it further includes a thread trimming support, the thread trimming lever is rotatably connected to the thread trimming support, the thread trimming support is also provided with a return spring, the return spring is sleeved on the lever limit pin fixed on the thread trimming support, and the return spring is located in the trimmer The angle between the thread lever and the conducting part to reset the thread trimming lever to the position where the thread trimming drive part is not pushed; the thread trimming drive part is connected with the elastic part to reset the thread trimming drive part to the non-conducting part Push the position.

Optionally, the front lifting crank includes a front locking end and a front extension end, the front locking end and the front extension end are connected, the front locking end is wrapped around the front lifting shaft, and the front extension end is along the diameter of the front lifting shaft Extend outward, and/or;

The rear lifting crank includes a rear locking end and a rear extension end, the rear locking end and the rear extension end are connected, the rear locking end wraps around the rear lifting shaft, and the rear extension end extends along the radial outside of the rear lifting shaft.

The present invention also provides a sewing machine, including the above-mentioned thread lifting and trimming assembly.

Compared with the above-mentioned background technology, the thread-lifting and thread-cutting assembly provided by the present invention utilizes the driving part to drive the thread-lifting driving device and the thread-cutting driving device to move, so as to realize the height adjustment of the feeding teeth and the thread-cutting action; specifically, the thread-lifting and thread-cutting The component uses a front tooth lifting shaft and a rear tooth lifting shaft arranged in parallel to replace a tooth lifting shaft in the prior art. The first end of the front lifting crank is connected to the front lifting swing plate, the rear lifting crank is connected to the first end of the rear lifting swing plate, the second end of the front lifting swing plate and the second end of the rear lifting swing plate. The two ends are respectively connected to one end of the tooth-lifting drive device by rotation; after the drive of the driving part, the tooth-lifting drive device moves, the angle between the front and rear tooth-lifting cranks changes, that is, the front-lifting crank Relative rotation occurs between the tooth shaft and the rear tooth shaft, and the phase angle of the front tooth shaft and the rear tooth shaft is changed, thereby achieving the purpose of adjusting the height of the feeding tooth. In short, in this application, the lifting shaft is set as a split type, and the front lifting shaft and the rear lifting shaft are arranged in parallel or coaxially. The phase of the front lifting shaft and the rear lifting shaft can be adjusted according to the sewing The working conditions are adjusted to control the height of the feeding teeth. It can be seen that, according to actual needs, the height of the feeding dog can be lowered below the needle plate when placing the fabric to avoid hanging the feeding dog hanging cloth. At the same time, after the thread trimming driving device is driven by the driving part, the thread trimming driving part and the thread trimming cam can be synchronously rotated to complete the thread trimming operation. With this arrangement, the single power source of the driving part can be used to complete the height adjustment of the feeding teeth and the thread trimming action, which improves the production efficiency and reduces the complexity of the structure.

The sewing machine provided by the present invention has the above-mentioned beneficial effects, which will not be repeated here.

Description of the drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only It is an embodiment of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on the provided drawings without creative work.

Figure 1 is a front view of a sewing machine with a thread-lifting and thread-cutting assembly provided by an embodiment of the present invention;

Figure 2 is a bottom view of a sewing machine with a thread-lifting and thread-cutting assembly provided by an embodiment of the present invention;

FIG. 3 is a structural diagram of the first tooth-lifting driving device of the tooth-lifting and thread-cutting assembly provided by an embodiment of the present invention;

4 is an exploded view of the first tooth lifting driving device of the tooth lifting and cutting thread assembly provided by an embodiment of the present invention;

Figure 5 is a partial exploded view of Figure 4;

Figure 6 is a structural diagram of the rocker in Figure 5;

FIG. 7 is a schematic diagram of the first thread-lifting driving device of the thread-lifting and trimming assembly provided by the embodiment of the present invention when the feeding teeth are at the highest point;

FIG. 8 is a schematic diagram of the first tooth lifting driving device of the thread lifting and trimming assembly provided by the embodiment of the present invention when the feeding teeth are at the lowest point;

9 is a schematic diagram of the first thread cutting drive device of the thread-lifting thread-cutting assembly provided by the embodiment of the present invention when the feeding tooth is at the lowest point;

Fig. 10 is a schematic diagram of the structure of the special-shaped rod in Fig. 9;

FIG. 11 is a functional section diagram of the driving part of the first thread-lifting and thread-cutting assembly provided by the embodiment of the present invention during the rotation process;

Figures 12-14 are schematic diagrams of the first thread-lifting and thread-cutting assembly provided by an embodiment of the present invention in different functional states;

15 is a schematic diagram of a second thread-lifting and thread-cutting assembly provided by an embodiment of the present invention;

16 is an exploded view of the second tooth lifting driving device of the tooth lifting and cutting thread assembly provided by an embodiment of the present invention;

Figure 17 is an exploded view of the second thread cutting drive device of the thread-lifting thread-cutting assembly provided by the embodiment of the present invention;

Figure 18 is a partial exploded view of Figure 17;

19 is a diagram of the functional interval of the driving part of the second thread-lifting and thread-cutting assembly provided by the embodiment of the present invention during the rotation process;

Figures 20-22 are schematic diagrams of the second thread-lifting and thread-cutting assembly provided by an embodiment of the present invention in different functional states.

in:

Upper shaft 1, driving part 2, feeding assembly 3, lifting spindle assembly 4, thread trimming assembly 5, thread trimming drive device 501, feeding shaft 6, lifting fork crank 7, feeding eccentric 8, and lifting connecting rod 9 , Feeding connecting rod 10, rear crank 11, front lift shaft 12, front lift sleeve 13, front lift crank 14, lift adjustment pin 15, rear lift crank 16, rear lift sleeve 17, Rear tooth lifting shaft 18, front tooth lifting crank pin 19, front tooth lifting swing plate 20, rear tooth lifting swing plate 21, rear tooth lifting crank pin 22, tooth lifting adjustment swing link 24, swing link pin 25, rocker 26. The first connecting hole 261, the second connecting hole 262, the third connecting hole 263, the connecting rod pin 27, the axial connecting piece 28, the driving connecting rod 29, the driving crank 30, the bracket 31, the feeding teeth 32, the needle plate 33 , Adjust the eccentric wheel 301,

Rotating crank 001, special-shaped rod 002, limit pin 003, thread trimming bevel 0021, equidistant surface 0022, mounting plate 0023, limit hole 0024, limit slot 0011

Thread trimming drive shaft 01, thread trimming cam 05, elastic part 06, thread trimming drive part 07, thread trimming drive abutment surface 08, push end 09, ball 022, return spring 023, thread trimming lever 024, rolling part 025, lever Limit pin 026, lever axis screw 027, trimming bracket 028.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

In order to enable those skilled in the art to better understand the solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

Example one:

An embodiment of the present invention provides a tooth-lifting thread trimmer assembly, as shown in Figures 1 to 14 of the specification, including a driving part 2, a front tooth-lifting shaft 12, and a rear tooth-lifting shaft 18, and the driving part 2 is connected to the tooth-lifting driving device And thread trimming drive device 501.

The front lifting shaft 12 and the rear lifting shaft 18 are arranged in parallel, one end of the feeding shaft 6 is fixedly connected to the feeding assembly 3, and the other end of the feeding shaft 6 is fixedly connected to the feeding swing plate seat assembly. The feeding assembly 3 is used to control the motion trajectory of the feeding teeth 32, the lifting spindle assembly 4 is used to complete the lifting phase adjustment, and the feeding swing plate seat assembly completes the feeding phase change. A key improvement part of this application is the lifting spindle assembly 4.

With reference to the prior art, it can be known that the feeding eccentric 8 is fixed on the upper shaft 1, one end of the lifting link 9 is rotatably connected to the feeding eccentric 8, and the other end of the lifting link 9 is rotatably connected to the crank 11 after lifting the teeth. One end of the feeding link 10 is rotatably connected to the feeding eccentric 8, and the other end of the feeding link 10 is rotatably connected to the feeding swing plate seat assembly; of course, the lifting link 9 and the feeding link 10 are respectively rotatably connected to the feeding eccentric 8 Different locations.

The fork type crank 7 is fixed on the front lifting shaft 12, the rear crank 11 is fixed on the rear lifting shaft 18, the front lifting shaft 12 and the front lifting crank 14 are fixedly connected, and the rear lifting shaft is fixed. 18 and the rear lifting crank 16 are fixedly connected, the front lifting crank 14 is rotatably connected to the first end of the front lifting swing plate 20, and the rear lifting crank 16 is rotatably connected to the first end of the rear lifting swing plate 21.

In the present application, the second end of the front lifting swing plate 20 and the second end of the rear lifting swing plate 21 are respectively rotatably connected with one end of the lifting driving device, that is, the front lifting swinging plate 20 is rotated by the lifting driving device. It is connected to the back lifting swing plate 21. Obviously, it can be considered that the front lifting spindle 12 and the rear lifting spindle 18 are connected by the lifting driving device.

Driven by the driving part 2, the tooth-lifting driving device moves, so that the angle between the front tooth-lifting crank 14 and the rear tooth-lifting crank 16 changes, that is, the front tooth-lifting shaft 12 and the rear tooth-lifting shaft 18 rotate relative to each other. The phase angle of the two is changed, thereby adjusting the height of the feeding dog 32, as shown in FIG. 7 and FIG. 8 of the specification.

At the same time, the thread trimming driving device is driven by the driving part 2 to make the thread trimming driving part 07 rotate synchronously with the thread trimming cam 05 to realize the thread trimming. Consistent with the prior art, the thread trimming cam 05 is fixed on the lower shaft, the thread trimming drive part 07 is fixed on the thread trimming drive shaft 01, and the lower shaft drives the thread trimming cam 05 to rotate. When the cam 05 rotates synchronously, the thread trimming drive shaft 01 rotates, and the thread trimming assembly 5 can complete the thread trimming operation.

For the driving part 2, it can be powered by stepping motors, piston cylinders, servo motors and other power and cases, and can realize power transmission through transmission mechanisms such as timing belts, gear transmissions, worm gears, and so on.

With reference to Figures 4 to 8 of the specification, the driving part 2 may include a tooth lifting adjustment swing link 24. The tooth lifting adjustment swing link 24 and the driving part 2 can be connected by a transmission device such as a timing belt, gear transmission, worm gear, etc. , To realize power transmission, the front crank 14 and the rear crank 16 are respectively located on both sides of one end of the swing link 24 for adjusting the teeth.

The front lifting crank 14 can be fixed to the end of the front lifting shaft 12, and the rear lifting crank 16 can be fixed to the end of the rear lifting shaft 18. In this embodiment, the front lifting crank 14 and the rear lifting crank 16 are preferably the same. The front crank 14 and the rear crank 16 are located adjacent to each other.

When the swing link 24 for adjusting the tooth lifting moves under the action of the driving part 2, it simultaneously drives the front lifting swing plate 20 and the rear lifting swing plate 21 to move, thereby driving the front lifting crank 14 and the rear lifting crank 16 to adjust The angle between the front lifting crank 14 and the rear lifting crank 16 changes the phase angle between the front lifting spindle 12 and the rear lifting spindle 18, thereby adjusting the height of the feeding teeth 32. The transmission device includes a rocker 26, a driving connecting rod 29 and a driving crank 30. The first position of the driving crank 30 is fixedly connected with the output shaft of the driving part 2. When the driving part 2 moves, the output shaft rotates, driving the driving crank 30 to rotate synchronously .

The second position of the driving crank 30 is rotatably connected to the first end of the driving link 29, the second end of the driving link 29 is rotatably connected to the first position of the rocker 26, and the second position of the rocker 26 is rotatably connected to the lifting and adjusting swing The third position of the connecting rod 24 and the rocker 26 is rotatably connected to the fixed end.

Obviously, when the output shaft of the driving part 2 rotates, the drive crank 30 rotates and swings, which drives the drive link 29 to swing, and then drives the rocker 26 to swing, and finally realizes the movement of the swing link 24 for adjusting the teeth lifting and adjusting the front teeth lifting crank The included angle between 14 and the rear crank 16.

The first position of the rocker 26 and the third position of the rocker 26 are respectively located at two ends of the rocker 26, and the second position of the rocker 26 is located between the first position of the rocker 26 and the third position of the rocker 26.

As shown in Fig. 6 of the specification, the first connecting hole 261 is used to insert the connecting rod pin 27, the connecting rod pin 27 rotationally connects the rocker 26 and the driving connecting rod 29, and the second connecting hole 262 is used to insert the swing connecting rod pin 25 to swing. The connecting rod pin 25 rotatably connects the rocker 26 and the tooth lifting adjustment swing link 24. The third connecting hole 263 is used for inserting the axial connection member 28, and the axial connection member 28 rotatably connects the rocker 26 to the fixed end.

Referring to Fig. 5 of the specification, the driving part 2 can be installed on the bracket 31, and the bracket 31 is provided with a mounting hole. The shaft connector 28 cooperates with the mounting hole to connect the rocker 26 to the bracket 31 in rotation.

The front lifting crank 14 includes a front locking end and a front extension end. The front locking end and the front extension end are connected. The front locking end surrounds the front lifting shaft 12, and the front extension end is along the radial direction of the front lifting shaft 12 Extending from the outside, the front lifting shaft 12 can also be provided with a front lifting shaft sleeve 13 which can be arranged on the bottom plate of the sewing machine.

The front lifting crank 14 can be integrally arranged. After bending, a front locking end and a front extension end are formed. The front locking end and the front lifting shaft 12 can be locked by screws, etc. The front extension end is used to swing with the front lifting teeth The plate 20 is connected in rotation. Obviously, the front extension end and the end of the front lifting swing plate 20 should be provided with a rotating shaft hole, so that the front lifting crank pin 19 penetrates the rotating shaft hole to realize the rotation between the front lifting crank 14 and the front lifting swing plate 20 connect.

Similar to the front lifting crank 14, the rear lifting crank 16 includes a rear locking end and a rear extension end. The rear locking end and the rear extension end are connected, and the rear locking end is wrapped around the rear lifting shaft 18, and the rear extension end It extends along the radially outer side of the rear lifting shaft 18. The rear lifting shaft 18 may also be provided with a rear lifting shaft sleeve 17, and the rear lifting shaft sleeve 17 may be provided on the bottom plate of the sewing machine. The rear tooth lifting crank 16 can be integrally arranged. After bending, a rear locking end and a rear extension end are formed. The rear locking end and the rear lifting shaft 18 can be locked by screws or the like, and the rear extension end is used to swing with the rear lifting tooth The plate 21 is connected in rotation.

Obviously, the rear extension end and the end of the rear tooth lifting swing plate 21 should obviously also be provided with a shaft hole, so that the rear tooth lifting crank pin 22 penetrates the shaft hole to realize the difference between the rear tooth lifting crank 16 and the rear tooth lifting swing plate 21 Rotating connection between.

On the above basis, the front extension end of the front lifting crank 14 may be provided with a front through groove, which extends along the radial direction of the front lifting shaft 12, and one end of the front lifting swing plate 20 extends into the front through groove. The tooth-lifting crank pin 19 extends axially along the front tooth-lifting shaft 12 and passes through a front through groove to rotatably connect the front-lifting swing plate 20 and the front extension end of the front tooth-lifting crank 14.

The other end of the front lifting swing plate 20 and the lifting adjusting swing link 24 can be rotatably connected by the lifting adjusting pin 15. The rear extension end of the rear tooth lifting crank 16 can be provided with a rear through groove, which extends along the radial direction of the rear lifting shaft 18, one end of the rear lifting swing plate 21 extends into the rear through groove, and the rear lifting crank pin 22 It extends axially along the rear tooth-lifting shaft 18 and passes through a rear through groove to rotatably connect the rear tooth-lifting swing plate 21 and the rear extension end of the rear tooth-lifting crank 16. The other end of the rear tooth lifting swing plate 21 and the tooth lifting adjusting swing link 24 can be rotatably connected by the tooth lifting adjusting pin 15.

It can be seen that the arrangement of the front lifting crank 14, the front lifting crank pin 19 and the front lifting swing plate 20 is similar to the rear lifting crank 16, the rear lifting swing plate 21 and the rear lifting crank pin 22. The way the person is set up.

In this embodiment, it is preferable that the front lifting shaft 12 and the rear lifting shaft 18 are arranged coaxially, and the shape and size of the front lifting crank 14 and the rear lifting crank 16 are the same, and they are arranged along the axial direction of the front lifting shaft 12 The projection of the direction is distributed in a herringbone shape.

In the normal sewing state, the driving part 2 is energized and locked, and the rocker 26 is fixed in a position at this time, and the feeding dog 32 is at the highest point as an example. At this time, the mechanism state is shown in FIG. 7. In this state, the front lifting swing plate 20 and the rear lifting swing plate 21 are in a straight line, and the angle between the front lifting crank 14 and the rear lifting crank 16 is the largest.

When the upper shaft 1 drives the feeding eccentric 8 to rotate, the tooth-lifting connecting rod 9 drives the tooth-lifting crank 11 to swing, and the swinging action of the tooth-lifting crank 11 is transmitted to the driving rear-lifting crank 16 through the rear-lifting shaft 18, so that The rear tooth-lifting crank 16 swings, and the front tooth-lifting swing plate 20, the rear-tooth-lifting swing plate 21 and the tooth-lifting adjustment swing link 24 drive the front-tooth-lifting crank 14 to swing at the same swing amplitude, and the front-tooth-lifting crank 14 passes the front tooth-lifting The shaft 12 drives the tooth-lifting fork-shaped crank 7 to swing to realize the reciprocating movement of the feeding tooth in the vertical direction.

The power of the feeding eccentric wheel 8 passes through the feeding connecting rod 10, the feeding swing plate seat assembly and the feeding shaft 6, and finally drives the feeding dog 32 to reciprocate in the horizontal direction, and finally realizes the sewing movement track of the feeding dog 32.

Before sewing starts, when the presser foot is raised to place the sewing cloth, the driving part 2 rotates clockwise, and the mechanism is in the state where the feeding teeth are at the lowest point, as shown in Fig. 8 of the manual. In this state, the feed dog 32 is under the needle plate 33, and the cloth will not be caught by the teeth during the cloth placement process. When the sewing conditions change and the height of the feeding dog 32 needs to be adjusted, the drive crank 30 rotates clockwise and can stop within the angle range corresponding to FIG. 8 and FIG. 7. When the drive crank 30 stops at a different position, The phase angle between the front lifting crank 14 and the rear lifting crank 16 is different (compare Fig. 7 and Fig. 8). The larger the phase angle, the higher the height of the feed dog 32, and the smaller the phase angle is. The lower the height of the feeding dog 32 is, so that the height adjustment of the feeding dog 32 is realized.

Another important improvement part of this application is the thread trimming drive device 501. The thread trimming drive device 501 may include a ball 022, a swinging part and a conductive part. The ball 022 is fixed to the thread trimming drive 07, and the conductive part is connected to the swinging part. When the driving part 2 is driven, the swing part will move. When the swing part moves a preset angle under the action of the output shaft of the driving part 2, the swing part triggers the movement of the conduction part, and the conduction part acts on the ball 022, and the ball 022 and the thread trimming cam 05 abut, so that the ball 022 and the thread trimming cam 05 Synchronous rotation.

The thread trimming drive shaft 01 and the lower shaft are usually arranged in parallel. In the initial state, a certain axial distance can be set between the ball 022 and the thread trimming cam 05. When the output shaft of the drive unit 2 rotates, it can drive to swing The oscillating part is used to trigger the movement of the conduction part. The conduction part transmits the force to the ball 022 so that the ball 022 moves in the axial direction to resist the thread trimming cam 05 and realize the synchronous rotation of the ball 022 and the thread trimming cam 05.

It can be seen that the main function of both the conduction part and the swing part is to convert the rotational motion of the output shaft of the drive part 2 into axial motion. There can be many specific arrangements for the conduction part and the swing part, and only given in this article A limited number of more preferred specific implementations.

As shown in Figure 2 and Figure 9 to Figure 14 of the specification, the swing part is specifically a rotating crank 001, and the conduction part is specifically a special-shaped rod 002. The special-shaped rod 002 includes a cutting bevel surface 0021 and an isometric surface 0022 on the same surface. The end of the rod 002 is rotatably connected with the rotating crank 001; both the thread cutting inclined surface 0021 and the equidistant surface 0022 can selectively contact the thread cutting drive shaft 01.

In the normal sewing state, the equidistant surface 0022 is in contact with the thread trimming drive shaft 01. At this time, the ball 022 and the thread trimming cam 05 are not in contact. The positional relationship between the feed dog 32 and the needle plate surface is shown in Figure 13 of the specification.

When the thread trimming operation is required, the thread trimming slope 0021 contacts the thread trimming drive shaft 01. At this time, the thread trimming drive shaft 01 moves in the axial direction, driving both the thread trimming drive part 07 and the ball 022 to move in the axial direction, so that The ball 022 and the thread trimming cam 05 collide, and the ball 022 and the thread trimming cam 05 rotate synchronously.

As shown in Figure 9 and Figure 10 of the specification, the end of the special-shaped rod 002 is provided with a bending section. The bending section includes two mounting plates 0023 arranged at intervals. The two mounting plates 0023 are provided with coaxial limiting holes 0024. The end of the crank 001 is provided with a limit slot 0011, the two ends of the limit pin 003 are respectively matched with the two limit holes 0024, and the limit pin 003 is matched with the limit slot 0011 to make the special-shaped rod 002 and the rotating crank 001 rotate connect.

When the main controller of the sewing machine receives the thread trimming signal, the output shaft of the driving part 2 rotates counterclockwise (taking the orientation shown in Figure 11 of the manual as an example), driving the rotating crank 001 to rotate counterclockwise, and the limit of the rotating crank 001 The slot 0011 drives the limit pin 003 and the special-shaped rod 002 to move toward the right, the thread trimming slope 0021 abuts the end of the thread trimming drive shaft 01, and drives the thread trimming drive shaft to move to the left (as shown in Figure 14 of the manual), driving the shears The thread driving part 07 and the ball 022 move to the left, and the ball 022 abuts the thread trimming cam 05. After the thread trimming cam 05 rotates, the thread trimming assembly 5 is driven to complete the thread trimming action.

When the thread trimming is completed, the output shaft of the drive unit 2 rotates clockwise, driving the special-shaped rod 002 to move to the left, the thread trimming drive shaft 01 resets, and enters the equidistant surface 0022. In the tooth height adjustment section and the lower supply section, the thread trimming drive The end of the shaft 01 will not be in contact with the thread cutting slope 0021 (as shown in Figure 12 and Figure 13 of the specification), that is, the action of lifting and lowering the thread will not affect the thread cutting, and finally realizes that the driving part 2 drives the lifting and cutting Line two functions.

Embodiment two:

The difference from the first embodiment above is that the driving part 2 can directly adjust the eccentric wheel 301 to realize the change of the included angle between the front lifting crank 14 and the rear lifting crank 16; specifically, the output shaft of the driving part 2 is fixed. The eccentric hole is provided in the adjusting eccentric wheel 301, and the end of the tooth lifting adjusting swing link 24 is fixed on the side edge of the adjusting eccentric wheel 301.

When the driving part 2 moves, the output shaft of the driving part 2 rotates, driving the adjustment eccentric 301 to rotate. Since the eccentric hole of the adjustment eccentric 301 is fixedly connected with the output shaft of the driving part 2, when the adjustment eccentric 301 rotates, the adjustment The side edge of the eccentric wheel 301 does not rotate around a fixed axis, but will swing, thereby driving the lifting adjustment swing link 24 to swing, thereby changing the angle between the front lifting crank 14 and the rear lifting crank 16 , So that the front lifting shaft 12 and the rear lifting shaft 18 are relatively rotated, as shown in FIG. 15 and FIG. 16 of the specification.

In addition, the front extension end of the front lifting crank 14 may not be provided with a front through groove. The front lifting swing plate 20 is located on one side of the front extension end of the front lifting crank 14. The front lifting crank pin 19 can also be used to achieve the front The rotation connection of the tooth lifting crank 14 and the front tooth lifting swing plate 20 is as shown in FIG. 9 and FIG. 10 of the specification.

Similarly, the rotational connection between the rear-lifting crank 16 and the rear-lifting swing plate 21 can refer to the above-mentioned different forms, which will not be repeated here.

Regarding the specific setting of the thread cutting drive device 501, as shown in FIG. 17 and FIG. 18 of the specification, since the adjusting eccentric 301 is used in the second embodiment instead of the linkage mechanism of the first embodiment, the thread cutting drive device 501 should also be used. Make corresponding improvements.

The swing part is specifically the thread trimming lever 024. The first end of the thread trimming lever 024 is rotatably connected to a fixed position. The second end of the thread trimming lever 024 is in sliding fit with the adjusting eccentric 301; the conduction part is located away from the thread trimming lever 024. At the end position, when the eccentric wheel 301 rotates by a preset angle, the thread trimming lever 024 rotates. Driven by the thread trimming lever 024, the conductive part pushes the thread trimming drive part 07 so that the ball 022 and the thread trimming cam 05 abut against each other.

The first end of the thread trimming lever 024 can be rotatably connected to the bracket 31, and the second end of the thread trimming lever 024 can be provided with a rolling part 025, which is used for rolling cooperation with the side edge of the adjusting eccentric 301.

The conduction part can be specifically a bent push end 09. Both the push end 09 and the thread trimming lever 024 can be integrally formed and are generally V-shaped. The thread trimming drive abutment surface 08 at the end abuts, and the side edge of the thread trimming drive abutment surface 08 is provided with balls 022. Among them, the thread trimming drive portion 07, the thread trimming drive abutment surface 08 and the ball 022 can be integrally formed.

The end surface of the thread trimming drive abutting surface 08 is larger than the cross section of the thread trimming drive portion 07 to increase the contact area of the pushing end 09, and the thread trimming drive abutment surface 08 is located in the radial direction of the thread trimming drive shaft 01.

In the normal sewing state, the output shaft of the driving part 2 is located in the tooth height adjustment section shown in Figure 19 of the specification. The height of the feeding teeth 32 can be controlled by the parameters of the main controller of the sewing machine; when the tooth height needs to be increased, the driving part 2 The output shaft rotates clockwise, and the adjusting eccentric wheel 301 drives the tooth-lifting adjusting swing link 24 to move.

Taking the feeding teeth adjusted from the lower position to the highest position as an example, the quadrilateral shape composed of the front lifting crank 14, the front lifting swing plate 20, the rear lifting swing plate 21 and the rear lifting crank 16 changes, and the front lifting crank The angle formed by the crank 14 and the rear crank 16 is the maximum state, as shown in Figure 21 of the specification, at this time the phase angle between the front crank 12 and the rear crank 18 is the largest, and the movement is transmitted through the feed assembly 3. After the state, the feeding teeth 32 can reach the highest position, as shown in Figure 21 of the specification.

When the presser foot is lifted, the output shaft of the drive unit 2 is located in the rapid decline section of the tooth height (the height of the feeding teeth 32) shown in FIG. When the swing link 24 is adjusted by lifting the teeth, the angle formed by the front lifting crank 14 and the rear lifting crank 16 decreases sharply. The phase angle between the two is the smallest. After the movement state is transmitted through the feeding assembly 3, the feeding dog 32 is below the needle plate surface, as shown in Figure 20 of the manual. At this time, the sewing cloth can be replaced or moved to avoid the defect of the feeding dog 32 hanging cloth. .

When the thread trimming action is required, the output shaft of the driving part 2 rotates counterclockwise, from the tooth height adjustment interval to the thread trimming interval, the eccentric wheel 301 is adjusted to drive the tooth lifting adjustment swing link 24 to move, the front tooth lifting crank 14, front lifting The quadrilateral shape composed of the tooth swing plate 20, the rear tooth lifting swing plate 21, and the rear tooth lifting crank 16 changes, and the angle formed by the front tooth lifting crank 14 and the rear tooth lifting crank 16 is first increased to that shown in Figure 21 of the specification. The state changes to the state shown in Fig. 22 of the specification, and the height of the feed dog 32 is lowered to near the plane of the needle plate. After the included angle between the front crank 14 and the rear crank 16 has passed the maximum angle, the eccentric wheel 301 is adjusted to drive the rolling part 025, and the rolling part 025 drives the thread trimming lever 024 to rotate counterclockwise around the lever shaft screw 027 to trim the thread After the lever 024 contacts the thread trimming drive abutting surface 08, the thread trimming drive part 07 moves to the left along the axis of the thread trimming drive shaft 01. At this time, the ball 022 drives the thread trimming drive part 07 to rotate under the drive of the thread trimming cam 05. Finally, the thread trimming assembly 5 is driven to complete the thread trimming action.

With reference to Figure 17 and Figure 18 of the specification, the lifting thread trimming assembly also includes a trimming bracket 028, the trimming bracket 028 can be fixed to the bracket 31, the trimming lever 024 is rotatably connected to the trimming bracket 028, and the return spring 023 is sleeved on The lever limit pin 026 fixed on the thread trimming bracket 028, the return spring 023 is located at the angle between the thread trimming lever 024 and the conducting part, so that the thread trimming lever 024 is reset to the position where the thread trimming drive part 07 is not pushed The thread trimming drive portion 07 and the elastic portion 06 are connected to reset the thread trimming drive portion 07 to a position not pushed by the thread trimming lever 024.

Taking the orientation shown in FIG. 18 of the specification as an example, the upper surface of the thread trimming bracket 028 is provided with a first hole on the left side and a second hole on the right side, and the thread trimming lever 024 is provided with a first through hole and a second hole. Through holes, the lever axis screw 027 passes through the first through hole of the thread trimming lever 024 and the first hole of the thread trimming bracket 028 from top to bottom, so that the thread trimming lever 024 can rotate with the lever axis screw 027 as an axis. The rolling portion 025 is rotatably connected to the second through hole of the thread trimming lever 024, and the rolling portion 025 can rotate relative to the thread trimming lever 024 to reduce the wear of the rolling portion 025. The second hole of the thread trimming bracket 028 is fixedly connected to the lever limit pin 026, and the return spring 023 can be set as a torsion spring or other components.

The elastic portion 06 and the thread trimming drive abutment surface 08 are respectively located at the two ends of the thread trimming drive portion 07. When the pushing end 09 pushes the thread trimming drive portion 07 to move along the axial direction of the thread trimming drive shaft 01, the elastic portion 06 is compressed. The left end of the elastic part 06 can be pressed against a fixed position. When the thread cutting driving part 07 is not pushed by the pushing end 09, the elastic force of the elastic part 06 is released, and the thread cutting driving part 07 and the thread cutting driving abutment surface are released. 08 and the ball 022 are reset to the position not pushed by the pushing end 09.

Continuing the operation process described above as an example, while the thread is trimming, the feeding dog 32 is in a lower state, which can further reduce the length of the thread head. After the thread is trimmed, the output shaft of the driving part 2 rotates clockwise and enters the tooth. The height adjustment interval is reset under the action of the elastic part 06, and the thread trimming lever 024 is reset under the action of the reset spring 023 and abuts against the lever limit pin 026.

Embodiment three:

The present invention provides a sewing machine with a thread lifting and trimming assembly, including the thread lifting and trimming assembly described in the first and second embodiments; other parts of the sewing machine can refer to the prior art and will not be expanded here.

It should be noted that in this specification, relational terms such as first and second are only used to distinguish one entity from other entities, and do not necessarily require or imply any such existence between these entities. The actual relationship or order.

The thread lifting and cutting thread assembly provided by the present invention and the sewing machine with the thread lifting and cutting thread assembly have been described in detail above. Specific examples are used in this article to illustrate the principle and implementation of the present invention. The description of the above examples is only used to help understand the method and core idea of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

A thread-raising and trimming assembly includes a driving part (2), and is characterized in that it also includes a front-raising shaft (12) and a rear-raising shaft (18) which are arranged in parallel, and the front-raising shaft (12) is fixed A front tooth lifting crank (14) is provided, the rear tooth lifting shaft (18) is fixedly provided with a rear tooth lifting crank (16), and the front tooth lifting crank (14) is rotatably connected with a front tooth lifting swing plate (20) The first end of the rear tooth lifting crank (16) is rotatably connected to the first end of the rear tooth lifting swing plate (21);

The driving part (2) is connected with a tooth lifting driving device and a thread trimming driving device, and both the second end of the front tooth lifting swing plate (20) and the second end of the rear tooth lifting swing plate (21) Rotatingly connected to one end of the tooth lifting driving device; after being driven by the driving part (2), the angle between the front tooth lifting crank (14) and the rear tooth lifting crank (16) Change so that the front lifting tooth shaft (12) and the rear lifting tooth shaft (18) both rotate relative to each other, so as to adjust the height of the feeding tooth;

The thread trimming drive device is connected to the thread trimming drive part (07); after being driven by the drive part (2), the thread trimming drive part (07) can rotate synchronously with the thread trimming cam (05) to realize thread trimming .
The thread lifting and cutting assembly according to claim 1, characterized in that the driving device for lifting the teeth comprises a lifting adjustment swing link (24), the second end of the front lifting swing plate (20) and the The second ends of the teeth lifting swing plate (21) are respectively rotatably connected to one end of the teeth lifting adjustment swing link (24), and the teeth lifting adjustment swing link (24) is connected to the The driving part (2), when the driving part (2) is driven, the tooth lifting adjusting swing link (24) swings.
The thread-lifting and thread-cutting assembly according to claim 2, wherein the thread-cutting drive device comprises a ball (022), a swinging part and a conducting part, and the ball (022) is fixed on the thread-cutting drive part. (07), the conducting part is connected to the swinging part, and when the swinging part moves a preset angle under the action of the output shaft of the driving part (2), the swinging part triggers the conducting part to move, The ball (022) is against the thread trimming cam (05) under the action of the conductive part, so that the ball (022) and the thread trimming cam (05) rotate synchronously.
The thread lifting and trimming assembly according to claim 3, characterized in that the transmission device comprises a rocker (26), a driving connecting rod (29) and a driving crank (30), and the first part of the driving crank (30) A position is fixedly connected with the output shaft of the driving part (2), the second position of the driving crank (30) is rotatably connected to the first end of the driving connecting rod (29), and the driving connecting rod (29) The second end of the rocker (26) is rotatably connected to the first position of the rocker (26), and the second position of the rocker (26) is rotatably connected to the tooth lifting adjustment swing link (24), and the rocker (26) The third position of) is rotatably connected to the fixed end.
The thread-lifting and thread-cutting assembly according to claim 4, characterized in that the thread-cutting drive part (07) is fixed to the thread-cutting drive shaft (01), and the swing part is specifically a rotating crank (001). The conducting part is specifically a special-shaped rod (002), the special-shaped rod (002) includes a cutting bevel (0021) and an isometric surface (0022) on the same surface, the end of the special-shaped rod (002) and the The rotating crank (001) is rotationally connected; both the thread trimming inclined surface (0021) and the equidistant surface (0022) can be selectively contacted with the thread trimming drive shaft (01);

When the thread trimming slope (0021) contacts the thread trimming drive shaft (01), the ball (022) and the thread trimming cam (05) abut against each other, so that the ball (022) and the thread trimming cam (05) abut The thread trimming cam (05) rotates synchronously.
The thread lifting and trimming assembly according to claim 5, characterized in that the end of the special-shaped rod (002) is provided with a bending section, and the bending section includes two mounting plates (0023) arranged at intervals, The two mounting plates (0023) are provided with coaxial limit holes (0024), the end of the rotating crank (001) is provided with a limit slot (0011), and the two ends of the limit pin (003) are connected to two One of the limiting holes (0024) is matched, and the limiting pin (003) is matched with the limiting groove (0011), so that the special-shaped rod (002) and the rotating crank (001) are rotatably connected .
The thread lifting and trimming assembly according to claim 3, characterized in that the transmission device is specifically an adjusting eccentric wheel (301), and the output shaft of the driving part (2) is fixed on the adjusting eccentric wheel (301). ), the end of the tooth lifting adjusting swing link (24) is rotatably connected to the adjusting eccentric wheel (301);

The swing part is specifically a thread trimming lever (024), the first end of the thread trimming lever (024) is rotatably connected to a fixed position, the second end of the thread trimming lever (024) and the adjusting eccentric wheel ( 301) Sliding fit;

The conducting part is arranged at a position far away from the second end of the thread trimming lever (024). When the adjusting eccentric wheel (301) rotates by a preset angle, the thread trimming lever (024) rotates, and the thread trimmer Driven by the thread lever (024), the conductive part pushes the thread trimming drive part (07) so that the ball (022) and the thread trimming cam (05) abut against each other.
The thread-raising and thread-cutting assembly of claim 7, further comprising a thread-cutting bracket (028), the thread-cutting lever (024) is rotatably connected to the thread-cutting bracket (028), and the thread-cutting The bracket (028) is provided with a lever limit pin (026), the lever limit pin (026) is sleeved with a return spring (023), and the return spring (023) is located between the thread trimming lever (024) and the The angle between the conductive parts, so that the thread trimming lever (024) is reset to the position where the thread trimming driving part (07) is not pushed; the thread trimming driving part (07) and the elastic part ( 06) is connected to reset the thread trimming drive part (07) to a position not pushed by the conducting part.
The tooth-lifting and cutting thread assembly according to any one of claims 1-8, wherein the front tooth-lifting crank (14) comprises a front locking end and a front extension end, and the front locking end and the The front extension ends are connected, the front locking end wraps around the front lifting shaft (12), and the front extension end extends along the radial outside of the front lifting shaft (12), and/or;

The rear lifting crank (16) includes a rear locking end and a rear extension end, the rear locking end is connected to the rear extension end, and the rear locking end is wrapped around the rear lifting shaft (18). ), the rear extension end extends along the radially outer side of the rear lifting shaft (18).
A sewing machine, characterized by comprising the thread lifting and trimming assembly according to any one of claims 1-9.